  [ u, ubar, - ]

  [ d, dbar, - ]

  [ g, g, + ]

  [ gh, ghbar, - ]


  [ ubar, u, g ]

  [ dbar, d, g ]

  [ ghbar, gh, g ]
  
  [ g, g, g ]
  
  [ g, g, g, g ]

% Extended vertices

% Dim-5

  [ ubar, u, g, g ]

  [ dbar, d, g, g ]

% Dim-6

  [ g, g, g, g, g ]

  [ ubar, u, ubar, u ]

  [ dbar, d, dbar, d ]

% Dim-7 (No new vertex in the topological sense)
